Why can placing a difficult subject in the most tired part of the day be a wrong strategy while making a timetable?

Correct answer: Because difficult work needs more energy and attention

Difficult learning tasks usually require sustained attention, working memory, and effort. If they are scheduled when the student is most tired, comprehension and persistence may fall, even though individual energy patterns differ. Placing them during a more alert period is often wiser; this does not mean difficult subjects should be avoided.